Bleddyn ap Gwilym
Source: Annals and Antiquities of the Counties and County Families of Wales by Thomas Nicholas, Vol. I, London, 1872, p. 362. Ancescor of the Morgans, Golden Grove ("Golgref"--Dwnn), co. of Flint.
From Welsh Biography Online (http://yba.llgc.org.uk/en/s1-GRIF-PEN-1300.html) :
"With his brother BLEDDYN, [Griffith ap Gwilym] d. in rebellion with Owain Glyndwr (q.v.) before Oct. 1406, but Bleddyn's descendants, together with those of Griffith ap Gwilym, through his youngest son, Rhys, continued to be represented in Flintshire and Denbighshire until the 16th cent. The personal connection of the family with Anglesey and Caernarvonshire began with the eldest and second sons of Griffith ap Gwilym."